e2e: use `operator api` for Networking suite validation (#12180)
e2e: use `operator api` for Networking suite validation (#12180)

With mTLS enabled, using `curl` in a bash script for validation
involves having to configure arguments to `curl` based on whether or
not the test infrastructure is using mTLS, whether ACLs are enabled,
etc. Use the new `operator api` command instead to pick up the client
configuration from the test environment automatically.
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